1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28/* 29 * 30 * netmap support for: re 31 * 32 * For more details on netmap support please see ixgbe_netmap.h 33 */ 34 35 36#include <net/netmap.h> 37#include <sys/selinfo.h> 38#include <vm/vm.h> 39#include <vm/pmap.h> /* vtophys ? */ 40#include <dev/netmap/netmap_kern.h> 41 42 43/* 44 * Register/unregister. We are already under netmap lock. 45 */ 46static int 47re_netmap_reg(struct netmap_adapter *na, int onoff) 48{ 49 if_t ifp = na->ifp; 50 struct rl_softc *adapter = if_getsoftc(ifp); 51 52 RL_LOCK(adapter); 53 re_stop(adapter); /* also clears IFF_DRV_RUNNING */ 54 if (onoff) { 55 nm_set_native_flags(na); 56 } else { 57 nm_clear_native_flags(na); 58 } 59 re_init_locked(adapter); /* also enables intr */ 60 RL_UNLOCK(adapter); 61 return (if_getdrvflags(ifp) & IFF_DRV_RUNNING ? 0 : 1); 62} 63 64 65/* 66 * Reconcile kernel and user view of the transmit ring. 67 */ 68static int 69re_netmap_txsync(struct netmap_kring *kring, int flags) 70{ 71 struct netmap_adapter *na = kring->na; 72 if_t ifp = na->ifp; 73 struct netmap_ring *ring = kring->ring; 74 u_int nm_i; /* index into the netmap ring */ 75 u_int nic_i; /* index into the NIC ring */ 76 u_int n; 77 u_int const lim = kring->nkr_num_slots - 1; 78 u_int const head = kring->rhead; 79 80 /* device-specific */ 81 struct rl_softc *sc = if_getsoftc(ifp); 82 struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc; 83 84 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 85 sc->rl_ldata.rl_tx_list_map, 86 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ? 87 88 /* 89 * First part: process new packets to send. 90 */ 91 nm_i = kring->nr_hwcur; 92 if (nm_i != head) { /* we have new packets to send */ 93 nic_i = sc->rl_ldata.rl_tx_prodidx; 94 // XXX or netmap_idx_k2n(kring, nm_i); 95 96 for (n = 0; nm_i != head; n++) { 97 struct netmap_slot *slot = &ring->slot[nm_i]; 98 u_int len = slot->len; 99 uint64_t paddr; 100 void *addr = PNMB(na, slot, &paddr); 101 102 /* device-specific */ 103 struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i]; 104 int cmd = slot->len | RL_TDESC_CMD_EOF | 105 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ; 106 107 NM_CHECK_ADDR_LEN(na, addr, len); 108 109 if (nic_i == lim) /* mark end of ring */ 110 cmd |= RL_TDESC_CMD_EOR; 111 112 if (slot->flags & NS_BUF_CHANGED) { 113 /* buffer has changed, reload map */ 114 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 115 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 116 netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag, 117 txd[nic_i].tx_dmamap, addr); 118 } 119 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 120 121 /* Fill the slot in the NIC ring. */ 122 desc->rl_cmdstat = htole32(cmd); 123 124 /* make sure changes to the buffer are synced */ 125 bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag, 126 txd[nic_i].tx_dmamap, 127 BUS_DMASYNC_PREWRITE); 128 129 nm_i = nm_next(nm_i, lim); 130 nic_i = nm_next(nic_i, lim); 131 } 132 sc->rl_ldata.rl_tx_prodidx = nic_i; 133 kring->nr_hwcur = head; 134 135 /* synchronize the NIC ring */ 136 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 137 sc->rl_ldata.rl_tx_list_map, 138 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 139 140 /* start ? */ 141 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START); 142 } 143 144 /* 145 * Second part: reclaim buffers for completed transmissions. 146 */ 147 if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) { 148 nic_i = sc->rl_ldata.rl_tx_considx; 149 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx; 150 n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) { 151 uint32_t cmdstat = 152 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat); 153 if (cmdstat & RL_TDESC_STAT_OWN) 154 break; 155 } 156 if (n > 0) { 157 sc->rl_ldata.rl_tx_considx = nic_i; 158 sc->rl_ldata.rl_tx_free += n; 159 kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim); 160 } 161 } 162 163 return 0; 164} 165 166 167/* 168 * Reconcile kernel and user view of the receive ring. 169 */ 170static int 171re_netmap_rxsync(struct netmap_kring *kring, int flags) 172{ 173 struct netmap_adapter *na = kring->na; 174 if_t ifp = na->ifp; 175 struct netmap_ring *ring = kring->ring; 176 u_int nm_i; /* index into the netmap ring */ 177 u_int nic_i; /* index into the NIC ring */ 178 u_int const lim = kring->nkr_num_slots - 1; 179 u_int const head = kring->rhead; 180 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 181 182 /* device-specific */ 183 struct rl_softc *sc = if_getsoftc(ifp); 184 struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc; 185 186 if (head > lim) 187 return netmap_ring_reinit(kring); 188 189 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 190 sc->rl_ldata.rl_rx_list_map, 191 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 192 193 /* 194 * First part: import newly received packets. 195 * 196 * This device uses all the buffers in the ring, so we need 197 * another termination condition in addition to RL_RDESC_STAT_OWN 198 * cleared (all buffers could have it cleared). The easiest one 199 * is to stop right before nm_hwcur. 200 */ 201 if (netmap_no_pendintr || force_update) { 202 uint32_t stop_i = nm_prev(kring->nr_hwcur, lim); 203 204 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */ 205 nm_i = netmap_idx_n2k(kring, nic_i); 206 207 while (nm_i != stop_i) { 208 struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i]; 209 uint32_t rxstat = le32toh(cur_rx->rl_cmdstat); 210 uint32_t total_len; 211 212 if ((rxstat & RL_RDESC_STAT_OWN) != 0) 213 break; 214 total_len = rxstat & sc->rl_rxlenmask; 215 /* XXX subtract crc */ 216 total_len = (total_len < 4) ? 0 : total_len - 4; 217 ring->slot[nm_i].len = total_len; 218 ring->slot[nm_i].flags = 0; 219 /* sync was in re_newbuf() */ 220 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 221 rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD); 222 // if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1); 223 nm_i = nm_next(nm_i, lim); 224 nic_i = nm_next(nic_i, lim); 225 } 226 sc->rl_ldata.rl_rx_prodidx = nic_i; 227 kring->nr_hwtail = nm_i; 228 kring->nr_kflags &= ~NKR_PENDINTR; 229 } 230 231 /* 232 * Second part: skip past packets that userspace has released. 233 */ 234 nm_i = kring->nr_hwcur; 235 if (nm_i != head) { 236 nic_i = netmap_idx_k2n(kring, nm_i); 237 while (nm_i != head) { 238 struct netmap_slot *slot = &ring->slot[nm_i]; 239 uint64_t paddr; 240 void *addr = PNMB(na, slot, &paddr); 241 242 struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i]; 243 int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN; 244 245 if (addr == NETMAP_BUF_BASE(na)) /* bad buf */ 246 goto ring_reset; 247 248 if (nic_i == lim) /* mark end of ring */ 249 cmd |= RL_RDESC_CMD_EOR; 250 251 if (slot->flags & NS_BUF_CHANGED) { 252 /* buffer has changed, reload map */ 253 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 254 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 255 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag, 256 rxd[nic_i].rx_dmamap, addr); 257 slot->flags &= ~NS_BUF_CHANGED; 258 } 259 desc->rl_cmdstat = htole32(cmd); 260 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 261 rxd[nic_i].rx_dmamap, 262 BUS_DMASYNC_PREREAD); 263 nm_i = nm_next(nm_i, lim); 264 nic_i = nm_next(nic_i, lim); 265 } 266 kring->nr_hwcur = head; 267 268 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 269 sc->rl_ldata.rl_rx_list_map, 270 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 271 } 272 273 return 0; 274 275ring_reset: 276 return netmap_ring_reinit(kring); 277} 278 279 280/* 281 * Additional routines to init the tx and rx rings. 282 * In other drivers we do that inline in the main code. 283 */ 284static void 285re_netmap_tx_init(struct rl_softc *sc) 286{ 287 struct rl_txdesc *txd; 288 struct rl_desc *desc; 289 int i, n; 290 struct netmap_adapter *na = NA(sc->rl_ifp); 291 struct netmap_slot *slot; 292 293 slot = netmap_reset(na, NR_TX, 0, 0); 294 /* slot is NULL if we are not in native netmap mode */ 295 if (!slot) 296 return; 297 /* in netmap mode, overwrite addresses and maps */ 298 txd = sc->rl_ldata.rl_tx_desc; 299 desc = sc->rl_ldata.rl_tx_list; 300 n = sc->rl_ldata.rl_tx_desc_cnt; 301 302 /* l points in the netmap ring, i points in the NIC ring */ 303 for (i = 0; i < n; i++) { 304 uint64_t paddr; 305 int l = netmap_idx_n2k(na->tx_rings[0], i); 306 void *addr = PNMB(na, slot + l, &paddr); 307 308 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 309 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 310 netmap_load_map(na, sc->rl_ldata.rl_tx_mtag, 311 txd[i].tx_dmamap, addr); 312 } 313} 314 315static void 316re_netmap_rx_init(struct rl_softc *sc) 317{ 318 struct netmap_adapter *na = NA(sc->rl_ifp); 319 struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0); 320 struct rl_desc *desc = sc->rl_ldata.rl_rx_list; 321 uint32_t cmdstat; 322 uint32_t nic_i, max_avail; 323 uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt; 324 325 if (!slot) 326 return; 327 /* 328 * Do not release the slots owned by userspace, 329 * and also keep one empty. 330 */ 331 max_avail = n - 1 - nm_kr_rxspace(na->rx_rings[0]); 332 for (nic_i = 0; nic_i < n; nic_i++) { 333 void *addr; 334 uint64_t paddr; 335 uint32_t nm_i = netmap_idx_n2k(na->rx_rings[0], nic_i); 336 337 addr = PNMB(na, slot + nm_i, &paddr); 338 339 netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag, 340 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr); 341 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 342 sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD); 343 desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 344 desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 345 cmdstat = NETMAP_BUF_SIZE(na); 346 if (nic_i == n - 1) /* mark the end of ring */ 347 cmdstat |= RL_RDESC_CMD_EOR; 348 if (nic_i < max_avail) 349 cmdstat |= RL_RDESC_CMD_OWN; 350 desc[nic_i].rl_cmdstat = htole32(cmdstat); 351 } 352} 353 354 355static void 356re_netmap_attach(struct rl_softc *sc) 357{ 358 struct netmap_adapter na; 359 360 bzero(&na, sizeof(na)); 361 362 na.ifp = sc->rl_ifp; 363 na.na_flags = NAF_BDG_MAYSLEEP; 364 na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt; 365 na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt; 366 na.nm_txsync = re_netmap_txsync; 367 na.nm_rxsync = re_netmap_rxsync; 368 na.nm_register = re_netmap_reg; 369 na.num_tx_rings = na.num_rx_rings = 1; 370 netmap_attach(&na); 371} 372 373/* end of file */ 374